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    Question

    The average age of 12 boys in the group is 9 years. If 2

    more boys join the group, the average is increased by 1 year. What is the average age (in years) of the two new boys in the group?
    A 10 Correct Answer Incorrect Answer
    B 12 Correct Answer Incorrect Answer
    C 16 Correct Answer Incorrect Answer
    D 9 Correct Answer Incorrect Answer

    Solution

    Average age of 12 boys in a group=9 years Total Age =12×9=108 years  3 more boys join the group so the total boys =12+2=14 boys  And increased average by 1=9+1=10 years So total age of 14 boys =14×10 =140 years total age of new 2 boys =140-108=32 years average age of new 2boys = 32/2=16 years  

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